JP2019197180A - Color conversion substrate, and light source unit, display, and lighting device including the same - Google Patents

Abstract

To achieve a wide color gamut and an even luminescence surface, in a color conversion substrate used for a light source unit, a display, and a lighting device.SOLUTION: A color conversion substrate includes at least: a first layer containing a luminescence material and a resin which convert incident light into light with a longer wavelength than that of the incident light; and a second layer having a light guide function. In the first layer, the luminescence material is organic, and the resin has a glass transition point of 80°C or more and 180°C or less.SELECTED DRAWING: None

Description

  The present invention relates to a color conversion substrate, a light source unit including the same, a display, and illumination.

  There are many studies on applying multi-color technology based on color conversion to liquid crystal displays, organic EL displays, lighting, and the like. The color conversion is to convert light emitted from the light emitter into light having a longer wavelength, for example, to convert blue light emission into green or red light emission.

  By forming a film having this color conversion function into a film and combining it with, for example, a blue light source, it is possible to extract the three primary colors of blue, green, and red from the blue light source, that is, to extract white light. A white light source combining such a blue light source and a film having a color conversion function is used as a backlight unit, and a liquid crystal driving portion and a color filter are combined, whereby a full color display can be manufactured. If there is no liquid crystal driving part, it can be used as a white light source as it is, and can be applied as a white light source such as LED lighting.

  A problem of a liquid crystal display using a color conversion method is improvement of a color gamut.

  As a means for solving this, a technique using quantum dots of inorganic semiconductor fine particles as a component of a color conversion composition (for example, see Patent Document 1), or an organic luminescent material instead of a quantum dot as a component of a color conversion composition A technique to be used has also been proposed (see, for example, Patent Document 2).

  Patent Document 1 proposes a technique in which a quantum dot layer and a barrier layer are formed on a light guide plate made of glass as a technique for achieving both improvement in color gamut and thinning of a display.

  In Patent Document 2, as a technique for improving the color gamut of a display, a technique in which a color conversion layer including an organic light emitting material is formed between a light guide plate and a reflection plate is proposed (for example, see Patent Document 4).

JP, 2006-181474, A Korean Patent Publication No. 2016-108074

  However, in the technique described in Patent Document 1, since the quantum dots are vulnerable to moisture and oxygen in the air, a barrier layer is necessary, and there is a concern that the thickness of the backlight increases and the member cost increases. Further, quantum dots have a problem of harmful elements such as cadmium, and cadmium-free quantum dots have a problem that the color gamut is low and the image quality of the display is low. In addition, since quantum dots have different emission wavelengths depending on the particle diameter, it is assumed that it is difficult to obtain a display having a uniform light emitting surface due to particle diameter variations.

  In addition, the technique described in Patent Document 2 has a special configuration in which an organic color conversion layer is formed between a light guide plate and a reflection plate, unlike a normal backlight configuration. Moreover, there is a concern that red light conversion becomes insufficient and the image quality of the display deteriorates.

  The problem to be solved by the present invention is to provide a color conversion substrate having a wide color gamut and a uniform light emitting surface in a color conversion substrate used for a light source unit, a display, an illumination device, and the like.

  As a result of intensive studies, when the glass transition temperature of the resin of the first layer is low, the organic light-emitting material flows in the color conversion layer and bleeds to the surface of the color conversion layer, thereby reducing the light guiding function and the organic conversion material. Was found to be non-uniformly present in the color conversion layer. That is, the present invention is a color conversion substrate having a first layer containing a light emitting material and a resin that converts incident light into light having a longer wavelength than the incident light, and a second layer having a light guiding function, The light-emitting material is an organic light-emitting material, and the glass conversion temperature of the resin of the first layer is 80 ° C. or higher and 180 ° C. or lower.

  Since the color conversion substrate of the present invention uses an organic light emitting material for the first layer, the color gamut is improved, and a resin having a glass transition temperature of 80 ° C. or higher and 180 ° C. or lower is used as the resin of the first layer. Therefore, the organic light emitting material can exist uniformly in the first layer. Therefore, a wide color gamut of the display and a uniform light emitting surface of the display can be obtained. Moreover, the image quality of the display containing the color conversion substrate of the present invention is improved.

The schematic cross section which shows an example of the color conversion base material of this invention. The schematic cross section which shows an example of the color conversion base material of this invention. The schematic cross section which shows an example of the light source unit of this invention. The schematic cross section which shows an example of the light source unit of this invention.

  Hereinafter, embodiments of the present invention will be specifically described. However, the present invention is not limited to the following embodiments, and various modifications may be made according to the purpose and application.

  The color conversion substrate of the present invention is a color conversion substrate having a first layer containing a light emitting material and a resin that converts incident light into light having a longer wavelength than the incident light, and a second layer having a light guiding function. The light emitting material is an organic light emitting material, and the glass transition point of the resin of the first layer is 80 ° C. or higher and 180 ° C. or lower.

  FIG. 1 shows an example of the color conversion substrate of the present invention. It has a first layer 1 and a second layer 2, and the first layer contains an organic light emitting material 4 and a resin 5.

<First layer of color conversion substrate>
In the present invention, the glass transition point of the resin used for the first layer needs to be 80 ° C. or higher and 180 ° C. or lower. A glass transition point of less than 80 ° C. is not preferable because it becomes difficult to obtain a display having a uniform light emitting surface. When the glass transition point is 100 ° C. or higher, the glass transition point is preferably 100 ° C. or higher and more preferably 110 ° C. or higher from the viewpoint of obtaining a display having a uniform light emitting surface. On the other hand, if the glass transition point exceeds 180 ° C., cracks are likely to occur in the first layer, which makes it difficult for the organic light emitting material molecules to flow and makes it difficult to obtain a display having a uniform light emitting surface. From the viewpoint of improving the uniformity of the light emitting surface of the display, the glass transition point is more preferably 170 ° C. or higher. The glass transition point of the resin can be set to the above range by changing the monomer composition or the like in an epoxy resin, a silicone resin, an acrylic resin, a polyester resin, a cycloolefin resin, or the like.

  The glass transition point can be measured with a commercially available measuring instrument [for example, a differential scanning calorimeter (trade name: DSC6220, heating rate: 0.5 ° C./min) manufactured by Seiko Denshi Kogyo Co., Ltd.].

  As examples of the resin of the first layer used in the present invention, an epoxy resin, a silicone resin, an acrylic resin, a polyester resin, a cycloolefin resin, and the like can be suitably used from the viewpoints of transparency, heat resistance, and the like. In addition, since a film forming process is easy, a thermosetting resin or a photocurable resin is also preferably used. Further, a mixture or copolymer of these resins may be used.

  The weight average molecular weight (Mw) of the first layer resin used in the present invention is 5,000 or more, preferably 15,000 or more, more preferably 20,000 or more, and further 500,000 or less, preferably 100. 50,000 or less, more preferably 50,000 or less. When the weight average molecular weight is within the above range, the compatibility with the organic light emitting material becomes good, and a color conversion substrate having a uniform light emitting surface can be obtained.

  The weight average molecular weight in the present invention is a value measured by a gel permeation chromatography method (GPC method). Specifically, after filtering the sample with a 0.45 μm pore size membrane filter, GPC (HLC-82A manufactured by Tosoh Corporation) (developing solvent: toluene, developing speed: 1.0 ml / min, column temperature 25 ° C., column: It is a value calculated | required by polystyrene conversion using Tosoh Corporation TSKgelG2000HXL).

  Examples of the first layer organic light emitting material used in the present invention include perylene compounds, coumarin compounds, pyromethene compounds, anthracene compounds, tetraazaporphyrin compounds, anthracene compounds from the viewpoint of improving the color gamut of the display. At least one selected from compounds can be suitably used.

  Among them, a pyromethene compound can be preferably used in terms of giving a high fluorescence quantum yield and a sharp emission spectrum.

  The pyromethene derivative suitably used in the present invention is a compound represented by the general formula (1).

X is C—R ⁷ or N. R ^{1 to} R ⁹ may be the same as or different from each other, and are hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, hydroxyl group, thiol group, alkoxy group, alkylthio group, aryl Ether group, arylthioether group, aryl group, heteroaryl group, halogen, cyano group, aldehyde group, carbonyl group, carboxyl group, ester group, carbamoyl group, amino group, nitro group, silyl group, siloxanyl group, boryl group, sulfo group It is selected from a condensed ring and an aliphatic ring formed between a group, a phosphine oxide group, and an adjacent substituent.

  In all of the above groups, hydrogen may be deuterium. The same applies to the compound described below or a partial structure thereof. In the following description, for example, a substituted or unsubstituted aryl group having 6 to 40 carbon atoms includes 6 to 40 carbon atoms including the carbon number contained in the substituent substituted on the aryl group. An aryl group. The same applies to other substituents that define the number of carbon atoms.

  Moreover, in all the above groups, the substituents in the case of substitution include alkyl groups, cycloalkyl groups, heterocyclic groups, alkenyl groups, cycloalkenyl groups, alkynyl groups, hydroxyl groups, thiol groups, alkoxy groups, alkylthio groups. , Aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, cyano group, aldehyde group, carbonyl group, carboxyl group, ester group, carbamoyl group, amino group, nitro group, silyl group, siloxanyl group, boryl group , A sulfo group and a phosphine oxide group are preferable, and specific substituents which are preferable in the description of each substituent are preferable. Moreover, these substituents may be further substituted with the above-mentioned substituents.

  “Unsubstituted” in the case of “substituted or unsubstituted” means that a hydrogen atom or a deuterium atom is substituted. In the compound described below or a partial structure thereof, the case of “substituted or unsubstituted” is the same as described above.

  Among all the above groups, the alkyl group is, for example, a saturated aliphatic hydrocarbon such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, etc. Represents a group, which may or may not have a substituent. There are no particular limitations on the additional substituent when it is substituted, and examples thereof include an alkyl group, a halogen, an aryl group, a heteroaryl group, and the like, and this point is common to the following description. Further, the number of carbon atoms of the alkyl group is not particularly limited, but is preferably in the range of 1 to 20 and more preferably 1 to 8 from the viewpoint of availability and cost.

  The cycloalkyl group represents, for example, a saturated alicyclic hydrocarbon group such as a cyclopropyl group, a cyclohexyl group, a norbornyl group, an adamantyl group, etc., which may or may not have a substituent. . Although carbon number of an alkyl group part is not specifically limited, Preferably it is the range of 3-20.

  The heterocyclic group refers to, for example, an aliphatic ring having atoms other than carbon such as a pyran ring, piperidine ring, and cyclic amide in the ring, which may or may not have a substituent. Good. Although carbon number of a heterocyclic group is not specifically limited, Preferably it is the range of 2-20.

  An alkenyl group refers to an unsaturated aliphatic hydrocarbon group containing a double bond such as a vinyl group, an allyl group or a butadienyl group, which may or may not have a substituent. . Although carbon number of an alkenyl group is not specifically limited, Preferably it is the range of 2-20.

  The cycloalkenyl group refers to an unsaturated alicyclic hydrocarbon group containing a double bond such as a cyclopentenyl group, a cyclopentadienyl group, a cyclohexenyl group, and the like. It may not have.

  An alkynyl group refers to, for example, an unsaturated aliphatic hydrocarbon group containing a triple bond such as an ethynyl group, which may or may not have a substituent. Although carbon number of an alkynyl group is not specifically limited, Preferably it is the range of 2-20.

  The alkoxy group refers to, for example, a functional group having an aliphatic hydrocarbon group bonded through an ether bond such as a methoxy group, an ethoxy group, or a propoxy group, and the aliphatic hydrocarbon group has a substituent. May not be included. Although carbon number of an alkoxy group is not specifically limited, Preferably it is the range of 1-20.

  The alkylthio group is a group in which an oxygen atom of an ether bond of an alkoxy group is substituted with a sulfur atom. The hydrocarbon group of the alkylthio group may or may not have a substituent. Although carbon number of an alkylthio group is not specifically limited, Preferably it is the range of 1-20.

  An aryl ether group refers to a functional group to which an aromatic hydrocarbon group is bonded via an ether bond, such as a phenoxy group, and the aromatic hydrocarbon group may or may not have a substituent. Also good. Although carbon number of an aryl ether group is not specifically limited, Preferably, it is the range of 6-40.

  An aryl thioether group is one in which the oxygen atom of the ether bond of the aryl ether group is substituted with a sulfur atom. The aromatic hydrocarbon group in the aryl thioether group may or may not have a substituent. The number of carbon atoms of the arylthioether group is not particularly limited, but is preferably in the range of 6 or more and 40 or less.

  The aryl group is, for example, phenyl group, biphenyl group, terphenyl group, naphthyl group, fluorenyl group, benzofluorenyl group, dibenzofluorenyl group, phenanthryl group, anthracenyl group, benzophenanthryl group, benzoanthracene group. An aromatic hydrocarbon group such as a nyl group, a chrycenyl group, a pyrenyl group, a fluoranthenyl group, a triphenylenyl group, a benzofluoranthenyl group, a dibenzoanthracenyl group, a perylenyl group, or a helicenyl group. Among these, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, an anthracenyl group, a pyrenyl group, a fluoranthenyl group, and a triphenylenyl group are preferable. The aryl group may or may not have a substituent. Although carbon number of an aryl group is not specifically limited, Preferably it is 6-40, More preferably, it is the range of 6-30.

When R ^{1 to} R ⁹ are substituted or unsubstituted aryl groups, the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, or an anthracenyl group, and a phenyl group, biphenyl Group, terphenyl group, and naphthyl group are more preferable. More preferred are a phenyl group, a biphenyl group, and a terphenyl group, and a phenyl group is particularly preferred.

  When each substituent is further substituted with an aryl group, the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, or an anthracenyl group. A phenyl group and a naphthyl group are more preferable. Particularly preferred is a phenyl group.

  Heteroaryl group is, for example, pyridyl group, furanyl group, thienyl group, quinolinyl group, isoquinolinyl group, pyrazinyl group, pyrimidyl group, pyridazinyl group, triazinyl group, naphthyridinyl group, cinnolinyl group, phthalazinyl group, quinoxalinyl group, quinazolinyl group, Benzofuranyl group, benzothienyl group, indolyl group, dibenzofuranyl group, dibenzothienyl group, carbazolyl group, benzocarbazolyl group, carbolinyl group, indolocarbazolyl group, benzofurocarbazolyl group, benzothienocarbazolyl Group, dihydroindenocarbazolyl group, benzoquinolinyl group, acridinyl group, dibenzoacridinyl group, benzoimidazolyl group, imidazopyridyl group, benzoxazolyl group, benzothiazolyl group, phenanthrolinyl group, etc. Atoms other than hydrogen shows a cyclic aromatic group having a single or a plurality of rings. However, the naphthyridinyl group is any of 1,5-naphthyridinyl group, 1,6-naphthyridinyl group, 1,7-naphthyridinyl group, 1,8-naphthyridinyl group, 2,6-naphthyridinyl group, and 2,7-naphthyridinyl group. Indicate. The heteroaryl group may or may not have a substituent. Although carbon number of a heteroaryl group is not specifically limited, Preferably it is 2-40, More preferably, it is the range of 2-30.

When R ^{1 to} R ⁹ are substituted or unsubstituted heteroaryl groups, examples of the heteroaryl group include pyridyl group, furanyl group, thienyl group, quinolinyl group, pyrimidyl group, triazinyl group, benzofuranyl group, benzothienyl group, indolyl group. Group, dibenzofuranyl group, dibenzothienyl group, carbazolyl group, benzimidazolyl group, imidazopyridyl group, benzoxazolyl group, benzothiazolyl group and phenanthrolinyl group are preferable, and pyridyl group, furanyl group, thienyl group and quinolinyl group are preferable. More preferred. Particularly preferred is a pyridyl group.

  When each substituent is further substituted with a heteroaryl group, the heteroaryl group includes pyridyl, furanyl, thienyl, quinolinyl, pyrimidyl, triazinyl, benzofuranyl, benzothienyl, indolyl, dibenzo A furanyl group, a dibenzothienyl group, a carbazolyl group, a benzimidazolyl group, an imidazopyridyl group, a benzoxazolyl group, a benzothiazolyl group, and a phenanthrolinyl group are preferable, and a pyridyl group, a furanyl group, a thienyl group, and a quinolinyl group are more preferable. Particularly preferred is a pyridyl group.

  Halogen represents an atom selected from fluorine, chlorine, bromine and iodine. The carbonyl group, carboxyl group, ester group, and carbamoyl group may or may not have a substituent. Here, examples of the substituent include an alkyl group, a cycloalkyl group, an aryl group, and a heteroaryl group, and these substituents may be further substituted.

  An amino group is a substituted or unsubstituted amino group. Examples of the substituent in the case of substitution include an aryl group, a heteroaryl group, a linear alkyl group, and a branched alkyl group. As the aryl group and heteroaryl group, a phenyl group, a naphthyl group, a pyridyl group, and a quinolinyl group are preferable. These substituents may be further substituted. Although carbon number is not specifically limited, Preferably it is 2-50, More preferably, it is 6-40, Most preferably, it is the range of 6-30.

  Examples of silyl groups include trimethylsilyl groups, triethylsilyl groups, tert-butyldimethylsilyl groups, propyldimethylsilyl groups, vinyldimethylsilyl groups, and other alkylsilyl groups, phenyldimethylsilyl groups, tert-butyldiphenylsilyl groups, An arylsilyl group such as a phenylsilyl group or a trinaphthylsilyl group is shown. Substituents on silicon may be further substituted. Although carbon number of a silyl group is not specifically limited, Preferably it is the range of 1-30.

A siloxanyl group refers to a silicon compound group via an ether bond such as a trimethylsiloxanyl group. Substituents on silicon may be further substituted. The boryl group is a substituted or unsubstituted boryl group. Examples of the substituent in the case of substitution include an aryl group, a heteroaryl group, a linear alkyl group, a branched alkyl group, an aryl ether group, an alkoxy group, and a hydroxyl group. Of these, an aryl group and an aryl ether group are preferable. The sulfo group is a substituted or unsubstituted sulfo group. Examples of the substituent in the case of substitution include an aryl group, a heteroaryl group, a linear alkyl group, a branched alkyl group, an aryl ether group, and an alkoxy group. Of these, a linear alkyl group and an aryl group are preferable. The phosphine oxide group is a group represented by -P (= O) R ¹⁰ R ¹¹ . R ¹⁰ R ¹¹ is selected from the same group as R ^{1 to} R ⁹ .

A condensed ring and an aliphatic ring formed between adjacent substituents are any two adjacent substituents (for example, R ¹ and R ^{2 in} the general formula (1)) bonded to each other to be conjugated or non-conjugated. Forming a cyclic skeleton. As a constituent element of such a condensed ring and an aliphatic ring, in addition to carbon, an element selected from nitrogen, oxygen, sulfur, phosphorus and silicon may be included. Moreover, these condensed rings and aliphatic rings may be condensed with another ring.

Since the compound represented by the general formula (1) exhibits a high emission quantum yield and has a small half-value width of the emission spectrum, it is possible to achieve both efficient color conversion and high color purity. Furthermore, the compound represented by the general formula (1) has various properties such as luminous efficiency, color purity, thermal stability, light stability and dispersibility by introducing an appropriate substituent at an appropriate position. And physical properties can be adjusted. For example, as compared to the case where R ¹ , R ³ , R ⁴ and R ⁶ are all hydrogen, at least one of R ¹ , R ³ , R ⁴ and R ⁶ is a substituted or unsubstituted alkyl group or a substituted or unsubstituted group. In the case of an aryl group, a substituted or unsubstituted heteroaryl group, better thermal stability and light stability are exhibited.

When at least one of R ¹ , R ³ , R ⁴ and R ⁶ is a substituted or unsubstituted alkyl group, the alkyl group includes a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, C1-C6 alkyl groups, such as a sec-butyl group, a tert-butyl group, a pentyl group, and a hexyl group, are preferable. Furthermore, as this alkyl group, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, and a tert-butyl group are preferable from the viewpoint of excellent thermal stability. Also, from the viewpoint of preventing concentration quenching and improving the emission quantum yield, this alkyl group is more preferably a sterically bulky tert-butyl group. Further, from the viewpoint of ease of synthesis and availability of raw materials, a methyl group is also preferably used as this alkyl group.

When at least one of R ¹ , R ³ , R ⁴ and R ⁶ is a substituted or unsubstituted aryl group, the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group or a naphthyl group, more preferably A phenyl group and a biphenyl group. Particularly preferred is a phenyl group.

When at least one of R ¹ , R ³ , R ⁴ and R ⁶ is a substituted or unsubstituted heteroaryl group, the heteroaryl group is preferably a pyridyl group, a quinolinyl group or a thienyl group, more preferably a pyridyl group , A quinolinyl group. Particularly preferred is a pyridyl group.

R ¹ , R ³ , R ⁴ and R ⁶ may all be the same or different, and a substituted or unsubstituted alkyl group is preferable because of good solubility in a binder resin and a solvent. In this case, the alkyl group is preferably a methyl group from the viewpoints of ease of synthesis and availability of raw materials.

When R ¹ , R ³ , R ⁴ and R ⁶ are all the same or different and are a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group, better thermal stability and This is preferable because it shows light stability. In this case, R ¹ , R ³ , R ⁴ and R ⁶ may all be the same or different, and are more preferably substituted or unsubstituted aryl groups.

  Some substituents improve multiple properties, but all have limited substituents that exhibit sufficient performance. In particular, it is difficult to achieve both high luminous efficiency and high color purity. Therefore, by introducing a plurality of types of substituents into the compound represented by the general formula (1), it is possible to obtain a compound that is balanced in light emission characteristics, color purity, and the like.

In particular, R ¹ , R ³ , R ⁴ and R ⁶ may all be the same or different, and in the case of a substituted or unsubstituted aryl group, for example, R ¹ ≠ R ⁴ , R ³ ≠ R ⁶ , R It is preferable to introduce a plurality of types of substituents such as ¹ ≠ R ³ or R ⁴ ≠ R ⁶ . Here, “≠” indicates a group having a different structure. For example, R ¹ ≠ R ⁴ indicates that R ¹ and R ⁴ are groups having different structures. By introducing a plurality of types of substituents as described above, an aryl group that affects the color purity and an aryl group that affects the light emission efficiency can be introduced at the same time, so fine adjustment is possible.

Among these, R ¹ ≠ R ³ or R ⁴ ≠ R ⁶ is preferable from the viewpoint of improving the light emission efficiency and the color purity in a balanced manner. In this case, for the compound represented by the general formula (1), one or more aryl groups that affect the color purity are introduced into the pyrrole rings on both sides, and the aryl that affects the luminous efficiency at other positions. Since groups can be introduced, both of these properties can be maximized. When R ¹ ≠ R ³ or R ⁴ ≠ R ⁶ , it is more preferable that R ¹ = R ⁴ and R ³ = R ⁶ from the viewpoint of improving both heat resistance and color purity.

  As the aryl group mainly affecting the color purity, an aryl group substituted with an electron donating group is preferable. The electron donating group is an atomic group that donates electrons to a substituted atomic group by an induced effect or a resonance effect in organic electronic theory. Examples of the electron donating group include those having a negative value as the Hammett's rule substituent constant (σp (para)). The Hammett's rule substituent constant (σp (para)) can be cited from the Chemical Handbook, Basic Revised 5th edition (II-380).

Specific examples of the electron donating group include, for example, an alkyl group (σp of methyl group: −0.17), an alkoxy group (σp of methoxy group: −0.27), an amino group (σp of —NH ₂ : − 0.66). In particular, an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms is preferable, and a methyl group, an ethyl group, a tert-butyl group, and a methoxy group are more preferable. From the viewpoint of dispersibility, a tert-butyl group and a methoxy group are particularly preferable. When these are used as the electron donating group, quenching due to aggregation of molecules is prevented in the compound represented by the general formula (1). be able to. Although the substitution position of the substituent is not particularly limited, it is necessary to suppress the twisting of the bond in order to increase the light stability of the compound represented by the general formula (1). It is preferable to bond to the position or para position. On the other hand, as the aryl group mainly affecting the luminous efficiency, an aryl group having a bulky substituent such as a tert-butyl group, an adamantyl group, or a methoxy group is preferable.

R ¹ , R ³ , R ⁴ and R ⁶ may be the same or different, and when they are substituted or unsubstituted aryl groups, R ¹ , R ³ , R ⁴ and R ⁶ are the same or different. It may be a substituted or unsubstituted phenyl group.

  As an organic light emitting material used in the color conversion substrate of the present invention, a light emitting material exhibiting light emission observed in a region having a peak wavelength of 500 nm or more and 580 nm or less by using excitation light having a wavelength of 430 nm or more and 500 nm or less (hereinafter referred to as “light emitting material”). It is preferable to include (referred to as “luminescent material (a)”). Hereinafter, light emission observed in a region having a peak wavelength of 500 nm or more and 580 nm or less is referred to as “green light emission”. In general, the higher the excitation light energy, the easier it is to cause decomposition of the material, but the excitation light in the wavelength range of 430 nm to 500 nm is relatively low excitation energy, which causes decomposition of the luminescent material in the color conversion composition. And green light emission with good color purity is obtained.

  The color conversion substrate of the present invention comprises (a) a light emitting material that emits light having a peak wavelength of 500 nm or more and 580 nm or less by using excitation light having a wavelength of 430 nm or more and 500 nm or less, and (b) a wavelength range of 430 nm or more and 580 nm or less. It is preferable to include a light emitting material exhibiting light emission observed in a region having a peak wavelength of 580 nm or more and 750 nm or less (hereinafter referred to as “light emitting material (b)”). Hereinafter, light emission observed in a region having a peak wavelength of 580 nm or more and 750 nm or less is referred to as “red light emission”.

  Since some of the excitation light in the wavelength range of 430 nm to 500 nm is partially transmitted through the color conversion film of the present invention, when a blue LED having a sharp emission peak is used, light emission with a sharp shape in each color of blue, green, and red White light having a spectrum and good color purity can be obtained. As a result, it is possible to efficiently create a larger color gamut with brighter colors, especially in displays. Also, in lighting applications, the light emission characteristics of the green and red regions are improved, compared with white LEDs that are currently combined with blue LEDs and yellow phosphors. It becomes.

  Examples of the luminescent material (a) include coumarin derivatives such as coumarin 6, coumarin 7, coumarin 153, cyanine derivatives such as indocyanine green, fluorescein derivatives such as fluorescein, fluorescein isothiocyanate, carboxyfluorescein diacetate, and phthalocyanine derivatives such as phthalocyanine green. Perylene derivatives such as diisobutyl-4,10-dicyanoperylene-3,9-dicarboxylate, pyromethene derivatives, stilbene derivatives, oxazine derivatives, naphthalimide derivatives, pyrazine derivatives, benzimidazole derivatives, benzoxazole derivatives, benzothiazoles Derivatives, imidazopyridine derivatives, azole derivatives, compounds having condensed aryl rings such as anthracene and derivatives thereof, aromatic amine derivatives, organic Metal complex compounds, and the like as preferred but not particularly limited thereto.

  Among these compounds, pyromethene derivatives are particularly suitable because they give high fluorescence quantum yield and good durability, and among them, the compound represented by the general formula (1) exhibits light emission with high color purity. To preferred.

  Examples of the luminescent material (b) include cyanine derivatives such as 4-dicyanomethylene-2-methyl-6- (p-dimethylaminostyryl) -4H-pyran, rhodamine B, rhodamine 6G, rhodamine 101, sulforhodamine 101 and the like. Rhodamine derivatives, pyridine derivatives such as 1-ethyl-2- (4- (p-dimethylaminophenyl) -1,3-butadienyl) -pyridinium-perchlorate, N, N′-bis (2,6-diisopropylphenyl) Perylene derivatives such as -1,6,7,12-tetraphenoxyperylene-3,4,9,10-bisdicarbimide, porphyrin derivatives, pyromethene derivatives, oxazine derivatives, pyrazine derivatives, naphthacene and dibenzodiindeno Compounds having condensed aryl rings such as perylene, derivatives thereof, organometallic complexes Compounds and the like as preferred but not particularly limited thereto.

  Among these compounds, pyromethene derivatives are particularly suitable because they give high fluorescence quantum yield and good durability, and among them, the compound represented by the general formula (1) exhibits light emission with high color purity. To preferred.

In the present invention, when the first layer contains both the light emitting material (a) exhibiting green light emission and the light emitting material (b) exhibiting red light emission, a part of the green light emission is red light emission. preferably from being converted, the content of w _a of the light-emitting material (a), the content w _b of the luminescent material (b) is a relation of w _a ≧ w _b, the content of each material The ratio is w _a : w _b = 1000: 1 to 1: 1 in terms of mass ratio, more preferably 500: 1 to 2: 1, and particularly preferably 200: 1 to 3: 1.

In the present invention, the content of the organic light emitting material in the first layer is 1.0 × 10 ⁻⁴ parts by weight to 30 parts by weight with respect to 100 parts by weight of the resin in the first layer. It is more preferably 0 × 10 ⁻³ parts by weight to 10 parts by weight, and particularly preferably 1.0 × 10 ⁻² parts by weight to 5 parts by weight.

<Second layer of color conversion substrate>
In the present invention, a glass or resin light guide plate can be suitably used as the second layer having a light guide function. As the light guide plate made of glass, those made of silicate glass, silica glass, borosilicate glass, and alkali-free glass can be suitably used from the viewpoint of transparency and hardness. As the polymer light guide plate, those made of polymethyl methacrylate or polycarbonate are preferably used in terms of transparency and hardness.

  The film thickness of the light guide plate is preferably from 0.1 mm to 10 mm, and more preferably from 0.3 mm to 3 mm. In particular, when the thickness of the light guide plate is set to 0.3 mm or more and 3 mm or less in a large television display or the like, it is preferable to use a glass light guide plate rather than a polymer light guide plate in terms of hardness.

<Third layer of color conversion substrate>
FIG. 2 shows an example of the color conversion substrate of the present invention. It has the 1st layer 1, the 2nd layer 2, and the 3rd layer 3, the organic light emitting material 4 and the resin 5 are contained in the 1st layer, and an air layer or a low refractive index is contained in the 3rd layer. Contains a resin layer. By forming an air layer or a low refractive index between the first layer and the second layer, the light guide property of the second layer is improved, and a display having a uniform light emitting surface can be obtained. Here, the air layer is a space formed when two layers are laminated. For example, in FIG. 2, the air layer is formed when the first layer 1 and the second layer 2 are bonded together. It refers to the third layer 3 that is a space to be formed. Examples of the air layer include not only air in the atmosphere but also dry air, nitrogen, oxygen, carbon dioxide, and argon.

  When the third layer contains an air layer, the gap between the air layers is preferably 0.1 μm or more and 20 μm or less. If the air layer gap is 0.1 μm or more, it is preferable because there is an effect that a light-guiding property of the second layer and a display having a uniform light emitting surface can be obtained, and if the air layer gap is 20 μm or less. It is preferable because the decrease in the amount of light in the air layer can be suppressed and the luminance can be improved.

  When the low refractive index resin layer is formed on the third layer, the thickness of the resin layer is preferably 0.1 μm or more and 20 μm or less. If the film thickness of the resin layer is 0.1 μm or more, it is preferable because there is an effect that a light-guiding property of the second layer and a display having a uniform light emitting surface can be obtained. If it exists, since the reduction | decrease in the light quantity in a resin layer can be suppressed and a brightness | luminance can be improved, it is preferable.

  The refractive index at a wavelength of 550 nm of the low refractive index resin layer is preferably 1.20 or more and 1.35 or less. A refractive index of 1.20 or more is preferable because luminance can be improved. A refractive index of 1.35 or less is preferable because the light guide property of the second layer and the uniformity of the light emitting surface of the display can be further improved.

  As the resin used for the low refractive index layer, an acrylic resin, a siloxane resin, a cycloolefin resin, a fluororesin, or the like can be suitably used. The low refractive index layer can also be adjusted in refractive index by using inorganic particles such as silica particles and alumina particles in the resin. A combination of a siloxane resin and silica particles is more preferable because both the transparency of the third layer and a low refractive index can be achieved.

<Light source unit>
The light source unit according to the present invention includes a light source, a reflective film, and the above-described color conversion substrate, and the light source is formed on the side surface of the color conversion substrate, and the first layer, the second layer, and the reflection It is formed from the exit surface side in the order of the film. FIG. 3 shows an example of the light source unit of the present invention. The first layer 1, the third layer 3, the second layer 2, and the reflective film 9 are provided in this order from the emission surface side (observer side), and the light source 8 is provided on the side surface of the second layer. The first layer contains the organic light emitting material 4 and the resin 5, the reflective film surface of the second layer contains the uneven pattern 7, and the third layer contains an air layer or a low refractive index resin layer. To do. By forming an air layer or a low refractive index between the first layer and the second layer, the light guide property of the second layer is improved, and a display having a uniform light emitting surface can be obtained.

  Here, the “side surface” in the present invention is a surface adjacent to the bottom surface when the emission surface side is the bottom surface. For example, in FIG. 3, the emission surface side of the second layer 2 is a surface in contact with the third layer 3, and the side surface of the second layer 2 is a surface adjacent to the surface in contact with the third layer 3. In other words, it is a surface excluding the surface in contact with the third layer 3 and the surface having the uneven pattern 7.

  In addition, the “emission surface side” in the present invention refers to the downstream side in the traveling direction of the light emitted from the light source toward the observer, and refers to the surface on the observer side. For example, referring to FIG. 3, the exit surface side is a surface facing the surface in contact with the third layer in the first layer.

  The light source is preferably a light emitting diode having a maximum light emission in a wavelength range of 400 nm to 500 nm. Further, this light source preferably has a maximum light emission in a wavelength range of 430 nm to 480 nm, and more preferably has a maximum light emission in a wavelength range of 450 nm to 470 nm.

  The reflective film may be a light diffusive reflective film such as a white film, but is preferably a regular reflective film. Here, the regular reflection property means that the glossiness measured at an incident angle of 60 ° and an outgoing angle of 60 ° is 100 or more as per JIS Z8741 (1997). The use of a specular reflective film can improve the brightness of the display.

  FIG. 4 shows an example of the light source unit of the present invention. It has the 2nd layer 2 and the reflective film 9 in order from the output surface side (observer side). Moreover, it has a 1st layer and a light source in order from the side surface of a 2nd layer. The first layer contains the organic light-emitting material 4 and the resin 5, and the second layer has an uneven pattern on the reflective film side.

  Compared to the case where the first layer is formed on the upper surface of the second layer (configuration shown in FIG. 3), the case where the first layer is formed between the light source and the second layer (configuration shown in FIG. 4). Since the area of the first layer is small, it is advantageous for cost reduction by reducing the amount of the first light emitting material used.

  The concavo-convex pattern of the second layer may be formed on the first layer side, but is preferably formed on the reflective film surface side. When the concave / convex pattern is formed on the first layer side, the concave / convex pattern is visually observed from the observer side, and the image quality of the display may be lowered.

  The concavo-convex pattern consists of inorganic fine particles such as silica, calcium carbonate, barium sulfate, titanium oxide, aluminum oxide, and aluminum hydroxide, and organic fine particles such as urethane beads, silicone beads, PMMA particles, MS particles, and styrene particles. It is formed using a composition dispersed in a binder resin such as a resin, a silicone resin, an acrylic resin, a polyester resin, or a cycloolefin resin. The particle diameter of the fine particles is preferably 0.1 μm or more and 50 μm or less.

  Examples of the method for forming the concavo-convex pattern include a screen printing method, an injection molding method, and a press molding method transfer method using the above-described composition. In the case of forming by screen printing, the composition in which the fine particles are dispersed in a binder resin is passed through a plate made of a mesh such as polyester or nylon to form a desired printing pattern on the light guide plate. it can.

<Display, lighting device>
The display and the illumination according to the embodiment of the present invention include at least the light source unit described above. For example, the above-described light source unit is used as a backlight unit for a display such as a liquid crystal display. The liquid crystal display of the present invention preferably includes an optical film such as a liquid crystal cell including a color filter, a polarizing film, and a brightness enhancement film in addition to the light source unit of the present invention.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited by these examples. In the following Examples and Comparative Examples, compounds G-1, G-2, G-3, and R-1 are the compounds shown below.

  Evaluation methods in Examples and Comparative Examples are as follows.

<Measurement of ¹ H-NMR>
¹ H-NMR of the compound was measured with a deuterated chloroform solution using superconducting FTNMR EX-270 (manufactured by JEOL Ltd.).

<Measurement of ²⁹ Si-NMR>
The ²⁹ Si-NMR measurement of the silica particle-containing polysiloxane was performed with a heavy acetone solution using a superconducting FT-NMR apparatus EX-270.

<Measurement of emission spectrum of light source unit including color conversion substrate>
A Kindle Fire HDX 7 backlight was used as a light source unit including a light source for evaluation. A blue LED having a peak wavelength of 446 nm, a reflection film, a color conversion substrate, a prism sheet, and a polarization reflection film are installed, and the emission spectrum (peak, half-value width) and luminance are measured using a spectral radiance meter manufactured by Konica Minolta Sensing Co., Ltd. Measurements were made.

<Evaluation of in-plane variation of color conversion substrate>
The above chromaticity data is measured at 20 locations, and the absolute value (Δx, Δy) of the difference between the average value (x, y) and the value with the largest change from the average value is calculated. Variation was evaluated. Note that, as the following (Δx, Δy) is smaller, the variation is smaller, so that a display having a uniform light emitting surface can be obtained.
“A” has both Δx and Δy of less than 0.005. “B” has a larger Δx and Δy, and is 0.005 or more and less than 0.010. “C” has a larger Δx and Δy of 0.010. As for "D" less than 0.015, the larger Δx and Δy is 0.015 or more.

<Calculation of color gamut of display including color conversion substrate>
From the emission spectrum data and the spectral data of the transmittance of the color filter, the color gamut in the (u ′, v ′) color space when the color purity was improved by the color filter was calculated. The calculated area of the color gamut in the (u ′, v ′) color space is BT. From the ratio when the color gamut area of the 2020 standard is 100%, the evaluation was made according to the following criteria. In addition, the higher the following coverage ratio, the wider the color gamut and the better the image quality of the display.
“A” has a coverage of 90% or more, “B” has a coverage of 80% or more and less than 90%, and “C” has a coverage of less than 80%.

<Measurement of refractive index>
Using a reflection spectrometer FE-3000 (manufactured by Otsuka Electronics Co., Ltd.), the refractive index for light having a wavelength of 550 nm was measured for the first layer and the third layer.

<Measurement of glass transition point>
Using a differential scanning calorimeter (DSC7000X) manufactured by Hitachi High-Tech Science Co., Ltd., observing the endothermic behavior while raising the temperature of the resin of the first layer from 30 ° C. to 10 ° C./min in a nitrogen atmosphere, and endotherm due to glass transition. The midpoint temperature of the behavior was taken as the glass transition temperature (Tg).

Synthesis Example 1 Silica Particle-Containing Polysiloxane Solution (PS-1)
In a 500 ml three-necked flask, 0.05 g (0.4 mmol) of methyltrimethoxysilane (KBM-13: manufactured by Shin-Etsu Chemical Co., Ltd.), trifluoropropyltrimethoxysilane (KBM-7103: Shin-Etsu Chemical Co., Ltd.) 0.66 g (3.0 mmol), trimethoxysilylpropyl succinic anhydride (KBM-967: manufactured by Shin-Etsu Chemical Co., Ltd.) 0.10 g (0.4 mmol), γ-acryloxypropyltrimethoxy Silane (KBM-5103: manufactured by Shin-Etsu Chemical Co., Ltd.) 7.97 g (34 mmol), 15.6 wt% silica particles in isopropyl alcohol dispersion (IPA-ST-UP: manufactured by Nissan Chemical Industries, Ltd.) 224.37 g was mixed, and 163.93 g of ethylene glycol mono-t-butyl ether was added. While stirring at room temperature, an aqueous phosphoric acid solution in which 0.088 g of phosphoric acid was dissolved in 4.09 g of water was added over 3 minutes. Thereafter, the flask was immersed in a 40 ° C. oil bath and stirred for 60 minutes, and then the oil bath was heated to 115 ° C. over 30 minutes. One hour after the start of temperature increase, the internal temperature of the solution reached 100 ° C., and was then heated and stirred for 2 hours (internal temperature was 100 to 110 ° C.) to obtain a silica particle-containing polysiloxane solution (PS-1). During the temperature rise and heating and stirring, nitrogen was flowed at 0.05 l (liter) / min. During the reaction, a total of 194.01 g of methanol and water as by-products were distilled out. The resulting silica particle-containing polysiloxane solution (PS-1) had a solid content concentration of 24.3% by weight, and the contents of polysiloxane and silica particles in the solid content were 15% by weight and 85% by weight, respectively.

(Example 1)
As a resin, 100 parts by weight of Hyper M4501 (acrylic resin, glass transition point 84 ° C.) manufactured by Negami Kogyo Co., Ltd., 0.40 parts by weight of pyromethene compound G-1 as an organic light emitting material, and pyromethene based as an organic light emitting material After 0.01 parts by weight of Compound R-1 and 300 parts by weight of toluene as a solvent were mixed, 1000 rpm was used using a planetary stirring and defoaming device “Mazerustar” (registered trademark) KK-400 (manufactured by Kurabo Industries, Ltd.). The mixture was stirred and degassed for 20 minutes to obtain a color conversion composition for forming a first layer. G-1 was synthesized by the method described in WO2009 / 116456, and R-1 was synthesized by the method described in WO2017 / 2707.

  Next, the color conversion composition was applied to the entire surface of the PET base layer side of the light diffusion film chemical mat 125PW (manufactured by Kimoto Co., Ltd., thickness 138 μm), heated at 120 ° C. for 20 minutes and dried. The base material A on which the first layer was formed was obtained (average thickness of the first layer: 15 μm).

  Next, using “Vylon” (registered trademark) 630 (polyester resin manufactured by Toyobo Co., Ltd.) as the resin, 300 parts by weight of toluene as a solvent is mixed with 100 parts by weight of the polyester resin, and then planetary agitation / desorption is performed. Using a foam apparatus “Mazerustar” (registered trademark) KK-400 (manufactured by Kurabo Industries Co., Ltd.), stirring and defoaming were carried out at 300 rpm for 20 minutes to obtain a resin composition for an adhesive layer.

  Next, as a second layer, an acrylic resin light guide plate (size: 7 inches, film thickness: 0.6 mm) was taken out from Kindle Fire HDX 7. After the resin composition for the adhesive layer is formed with a width of 0.5 mm on the outer peripheral portion of the light guide plate where the uneven pattern is not formed, the resin composition for the adhesive layer is heated at 120 ° C. for 20 minutes and dried. A base material B (an average film thickness of the adhesive layer of 10 μm) having an adhesive layer formed on the outer periphery of the layer was obtained.

  Next, using the base material A and the base material B, heating lamination is performed so that the outer peripheral portion of the first layer of the base material A and the outer peripheral portion of the adhesive layer of the base material B are laminated. In a portion excluding the portion, an air layer was formed as a third layer between the first layer and the second layer. As described above, a color conversion substrate having a configuration of “second layer (light guide layer) / third layer (air layer) / first layer (color conversion layer) / light diffusion layer” was produced.

(Example 2)
Color conversion is carried out in the same manner as in Example 1 except that Nepal Industrial Co., Ltd., Hyperl, M4006 (acrylic resin, glass transition point 105 ° C.) is used as the resin for the color conversion composition for producing the color conversion layer. A substrate was prepared.

(Example 3)
The color conversion is performed in the same manner as in Example 1 except that Optimas 6000 (acrylic resin, glass transition point 120 ° C.) manufactured by Mitsubishi Gas Chemical Co., Ltd. is used as the resin of the color conversion composition for producing the color conversion layer. A substrate was prepared.

(Example 4)
A color conversion substrate is prepared in the same manner as in Example 1 except that the coumarin compound G-2 and the pyromethene compound R-1 are used as the organic light emitting material of the color conversion composition for preparing the color conversion layer. did.

(Example 5)
A color conversion substrate was prepared in the same manner as in Example 1 except that perylene compound G-3 and pyromethene compound R-1 were used as the organic light-emitting materials of the color conversion composition for preparing the color conversion layer. did.

(Comparative Example 1)
From Kindle Fire HDX 7, a quantum dot sheet (containing quantum dots as a light emitting material) was taken out as a first layer, and a light guide film (size: 7 inches) was taken out as a second layer. Next, in the same manner as in Example 1, an adhesive layer was formed on the outer peripheral portions of the first layer and the second layer to produce a color conversion substrate.

(Comparative Example 2)
Color conversion is carried out in the same manner as in Example 1 except that Nepal Industrial Co., Ltd., Hyperl, M6701 (acrylic resin, glass transition point 26 ° C.) is used as the resin for the color conversion composition for producing the color conversion layer. A substrate was prepared.

(Example 6)
54 g of the silica particle-containing polysiloxane solution (PS-1) obtained in Synthesis Example 3 was mixed with 12 g of ethylene glycol mono-t-butyl ether (ETB) and 35 g of diacetone alcohol (DAA). Then, it filtered with the 0.45 micrometer syringe filter, and prepared the resin composition for 3rd layer formation.

  Next, a light guide film (size: 7 inches) was taken out from Kindle Fire HDX 7 as the second layer. The third layer-forming resin composition was applied to the entire surface of the light guide film where the uneven pattern was not formed, and heated and cured at 150 ° C. for 30 minutes to form a third layer. .

  Next, the color conversion composition obtained in Example 3 was applied to the front surface of the resin layer of the third layer, heated at 120 ° C. for 20 minutes, and dried to form a first layer (first Substrate A having an average film thickness of 15 μm), the first layer, and the second to third layers were obtained.

  Next, the resin composition for the adhesive layer obtained in Example 1 was applied to the entire surface of the PET base layer side of the light diffusing film chemical mat 125PW (manufactured by Kimoto Co., Ltd., thickness 138 μm) at 120 ° C. And heated for 20 minutes to obtain a substrate B on which an adhesive layer was formed.

  Next, using the base material A and the base material B, heating lamination is performed so that the entire surface of the third layer of the base material A and the entire surface of the adhesive layer of the base material B are in contact with each other. A color conversion substrate was obtained. As described above, a color conversion substrate having a configuration of “second layer (resin light guide plate) / third layer (low refractive index resin layer) / first layer (color conversion layer) / light diffusion layer” is obtained. Produced.

  The refractive index of the third layer at a wavelength of 550 nm was 1.28, and the thickness of the third layer was 5 μm.

(Example 7)
As a resin, manufactured by Negami Kogyo Co., Ltd., Hyperl M4501 (acrylic resin, glass transition point 84 ° C.)
After mixing polymethylmethacrylic acid particles (average particle diameter: 5 μm) manufactured by Toyobo Co., Ltd. as 100 parts by weight of diffusing particles, a planetary stirring and defoaming device “Mazerustar” (registered trademark) KK-400 ( Kurabo Industries Co., Ltd.) was used and stirred and degassed at 1000 rpm for 20 minutes to obtain a second uneven pattern forming composition.

  Next, as a second layer, on one side of a glass plate (size: 7 inches, film thickness: 0.6 mm), a screen printing machine (LS-560 manufactured by Neurong Seimitsu Kogyo) and a 355 mesh nylon screen plate (Mesh Co., Ltd.) was used to form a convex pattern with an average film thickness of 10 μm. The area of the convex pattern is 12% for the long side of the 7-inch glass near the light source, and 32% for the long side of the long side of the 7-inch glass (32% near the light source). The screen plate was designed so that the area increased linearly.

  Next, the third layer and the first layer were formed on the entire surface of the glass light guide plate where the uneven pattern was not formed in the same manner as in Example 6, and the “second layer (made of glass A color conversion substrate having a configuration of “light guide plate) / third layer (low refractive index resin layer) / first layer (color conversion layer) / light diffusion layer” was produced.

  Various evaluations of the color conversion substrates obtained in Examples 1 to 7 and Comparative Examples 1 and 2 were performed. The evaluation results are shown in Table 1.

  In Comparative Example 1, since quantum dots were contained as the light emitting material of the color conversion substrate, the color gamut and in-plane variation were poor. Moreover, in Comparative Example 2, although the organic light emitting material was contained as the light emitting material of the color conversion substrate, the glass transition temperature of the resin of the first layer was as low as 26 ° C., so the in-plane variation was poor. .

  On the other hand, in Examples 1-6, an organic light emitting material is contained as the light emitting material of the color conversion substrate, and since the glass transition point of the resin of the first layer is 80 to 180 ° C., the color gamut and in-plane variation are different. It was good. In particular, Examples 3, 6, and 7 use a pyromethene compound as the organic light emitting material, and the glass transition point of the resin of the first layer is 110 ° C. or higher, so that the color gamut and in-plane variation are particularly good. Met.

  Table 1 shows the evaluation of luminance for Examples 3 and 6 in which the color gamut and in-plane variation were good. Compared with Example 3, Example 6 has improved luminance, and it was confirmed that the luminance was improved by the low refractive index layer.

DESCRIPTION OF SYMBOLS 1 1st layer 2 2nd layer base material layer 3 3rd layer base material layer 4 Organic luminescent material 5 contained in 1st layer 5 Resin contained in 1st layer 6 Resin contained in 3rd layer 7 Uneven pattern 8 Light source 9 Reflective film

Claims (12)

A color conversion substrate having a first layer containing a light emitting material and a resin that converts incident light into light having a longer wavelength than the incident light, and a second layer having a light guiding function, wherein the light emitting material is organic A color conversion substrate, which is a light-emitting material and has a glass transition point of 80 ° C. or higher and 180 ° C. or lower of the resin of the first layer. The color conversion substrate according to claim 1, wherein the organic light emitting material is at least one selected from a perylene compound, a coumarin compound, a pyromethene compound, an anthracene compound, a tetraazaporphyrin compound, and an anthracene compound. The color conversion base material of Claim 1 or 2 in which the said pyromethene type compound contains the compound represented by General formula (1).

(X is C—R ⁷ or N. R ^{1 to} R ⁹ may be the same as or different from each other, hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, Hydroxyl group, thiol group, alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, cyano group, aldehyde group, carbonyl group, carboxyl group, ester group, carbamoyl group, amino group, nitro Selected from among a condensed ring and an aliphatic ring formed between a group, a silyl group, a siloxanyl group, a boryl group, a sulfo group, a phosphine oxide group, and an adjacent substituent. The color conversion substrate according to claim 1, wherein the light guide plate of the second layer is made of glass. The color conversion base material in any one of Claims 1-4 which contains an air layer as a 3rd layer. The color conversion base material in any one of Claims 1-4 which contains a resin layer as a 3rd layer. The substrate according to claim 6, wherein the third layer has a refractive index of 1.20 to 1.35 at a wavelength of 550 nm. A light source unit comprising a light source, a reflective film, and the color conversion substrate according to claim 1, wherein the light source is formed on a side surface of the color conversion substrate, and the first layer, The light source unit in which the second layer and the reflective film are formed in this order from the emission surface side. It is a light source unit containing a light source, a reflective film, and the color conversion base material in any one of Claims 1-7, Comprising: A 1st layer and a light source are formed in an order from the side surface of said 2nd layer. Light source unit. An uneven pattern is formed in the second layer, and the uneven pattern is
The light source unit according to claim 8, wherein the light source unit is formed on the reflective film surface side. A display comprising the light source unit according to claim 8. Illumination including the light source unit according to claim 8.

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